Code 018: release undelivered refund check freeze.
From IRS Document 6209, the IRS's processing codes manual.
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This code is rare on refund timelines. The IRS's own description is on the right.
Document 6209 says
Used on individual (IMF) accounts.
Release Undelivered Refund Check Freeze
The full Document 6209 entry, as printed
I/B Release Undelivered Refund Check Freeze 64 Updates address: releases all 740 freezes in the account. IMF-Unpostable 174 if no 740 freeze is present.
After code 018
Not enough shared timelines with this code yet. The block fills in once 30 people with code 018 share theirs from the result page.
Crowd figures, not IRS data. They describe what happened to others, not a promise.
Questions people ask
What does code 018 mean on my IRS transcript?
Document 6209 calls it "Release Undelivered Refund Check Freeze".
Sources
Checked against these sources on October 30, 2026.